Edison-screw switch-holder for incandescent lamps.



PATBNIED MAR. 24, 1903.

APPLIOATION FILED MAY 17, 1902-.

IIO'MODEL.

UNITED STATES TEIcE.

PATENT osoAR ZIELINSKI, or BERLIN, GERMANY.

announcement forming part of Letters Patent No. 723,510, dated March 24, 1903.

Application filed May 17. 1902.

To a, whom it may concern:

Be it known that I, OsoAR ZIELINSKI, engineer, a subject of the German Emperor, and a resident of 4.- Liibeckerstrasse, Berlin, Germany, have invented new and useful Improvements in the Construction of Edison- Screw Switch Holders for Incandescent Lamps, of which the following is a specification.

This invention relates to improvements in the construction of Edison-screw switch-holders for incandescent lamps.

The object of the invention is to simplify the construction, so that the lamp can be easily and quickly fitted into the switchholder, and to reduce the metal parts in the construction of the switch-holder to a minimum, so that this improved sleeve for incandescent lamps offers the highest possible security against short circuit.

In the accompanying drawings, Figure 1 is a vertical section through an improved switch-holder with the lamp-bulb inserted. Fig. 2 shows the socket for the center contact in front View. Fig. 3 is a vertical section, and Fig. 4 a plan, of Fig. 2.

The lamp-globe Z is screwed into the bottom end of the switch-holder at in the usual manner. The switch-holder a is made of porcelain, glass, or any other suitable nonconducting material. The screw-threads of the switch-holder a are provided with a metal lining e in the well-known manner.

In the upper part of the inner boring of the switch holder a the switch, with the switch-wheel h, is mounted. On the socket b of the center contact, made of stone, porcelain, or similar material, the clamping de-. vices c d and the conducting-springs r s are fixed. One of the clamps, 0, forms at the same time the center contact for the bulb. The upper surface of the socket b has two upwardly extending insulating brackets m, which correspond on their outer surface in shape with the inner Wall of the boring of the switch-holderorsleevea. (SeeFig.2.) These brackets on serve for guiding the socket and at the same time for insulating the terminals of the service-wires. For this purpose these Serial No. 107,845. (No modelJ.

contacts have grooves m, Figs. 3 and 4, for the reception of the filaments.

The socket b of the center contact is insorted into the sleeve or switch-holder ct from the bottom through the thread-fitting e and pushed upward until the upper ends of the brackets m abut against the upper end of the inner boring of the sleeve. The contactsprings r 3 now grip over the teeth of the switch-wheel and a springf, which is secured to the metal lining e of the threads, pressed against a screw g, which is provided in the socket and connected with the spring-contact s. The socket b lies loosely in the boring of the switch-holder, being only secured in its position by the contact-springs "rs and the springf until it is entirely secured, when the neck of the globe Z is screwed into the threadfitting 6.. By inserting the socket b the connection is established with the metal lining e of the thread from the clamp device d over the spring-contact r, the switch-wheel h, spring-contact s, screw g, and springf.

It is very simple to fit this improved switchholder to the incandescent lamp. The service-wires are inserted through the opening 2' of the switch-holder (6, connected with the clamps c d, and passed through the grooves w of the brackets m. In pulling up the conducting-wires the socket b is brought into its proper position, (shown in Fig. 1,) whereupon thev bulb Z of the lamp is screwed. in.

' Having fully described my invention, what I claim, and desire to secure by Letters Patout, is-

Improved Edison-screw switch-holder for incandescent lamps made of insulating material comprising in combination with the usual sleeve having screw-threads at the bottom end of its boring, and a metal lining for the threads, a switch with switch wheel arranged onthe top end of the inner boring of the sleeve, a socket for the center contact made of insulating material, upwardly-extending guiding brackets on said. socket equally made of insulating material and corresponding in shape with the upper end of the inner boring of the sleeve, grooves in these brackets for the reception of the service-wires,

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- [O nesses.

OSCAR ZIELINSKI.

W i t n esses WOL'DEMAR HAUPT, HENRY HASPER. 

